HR: 13:45h
AN: NB13C-02    [Abstracts]
TI: Taxonomic and Functional Clumping of Exotic Macroinvertebrates: the Case of French Inland Waters
AU: * Beisel, J
EM: beisel@sciences.univ-metz.fr
AF: Univ. Paul Verlaine - Metz, Biodiversity and Ecosystem Functioning Lab., Campus Bridoux, Metz, 57000 France
AU: Devin, S
EM: devin@cict.fr
AF: Univ. Paul Sabatier - Toulouse III, UMR 5172, Bat. 4R3, 118 route de Narbonne, Toulouse Cedex 4, 31062 France
AU: Bollache, L
EM: loic.bollache@u-bourgogne.fr
AF: Univ. Bourgogne - UMR 5561 Biog‚osciences, 6, Bd Gabriel, Dijon, 21000 France
AU: Noel, P
EM: pnoel@mnhn.fr
AF: Museum National d'Histoire Naturelle - UMR 5178, 55, rue Buffon, Paris, 75005 France
AB: The introduction of exotic species and biological invasions are now considered to be a major driver of change of freshwater biodiversity. The analysis of a database allowed to review a list of 43 French freshwater exotic species, which represent 1.2 % of the French freshwater macroinvertebrates. We analysed their geographic origins, their distributions among zoological units by comparison with the native fauna and their functional characteristics according to a recent typology based on bio/ecological traits. At least six of these exotic species can be considered as invasives. An exponential trend of the cumulated number of non-indigenous species over time was evidenced, with a classical clumping of exotics within crustaceans and molluscs. Donor areas of exotic species are in majority European, and the Ponto-Caspian basin is identified as the principal one. This pattern could be explained by a spread along waterways but its origin lies in a process of recolonisation of defaunated areas following several episodes of glaciation / deglaciation in Western Europe during the last 80,000 years. Finally, from a functional point of view, exotic species exhibit a limited functional diversity, with two functional groups representing 80 % of them.
DE: 4804 Benthic processes/benthos
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly